Question

A student score the following marks in five tests : 45, 54, 41, 57, 43. His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is:
(A)
10/3
(B)
100/3
(C)
100/√3
(D)
10/√3​

Answer 1

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Option 3 is correct answer